Ignore 0% battery readings in low-battery alerting

A 0% batteryLevel is an invalid/no-data value (no battery wired or
misconfigured node), not a genuinely critical battery, so it must not
produce a "⚠️ battery low" alert. Add a non-positive guard to
shouldAlert after the undefined check: 0 (and any non-positive) now
skips, while 1-20 still alert and >20 still doesn't. Threshold/cooldown/
batching unchanged.

Tests: 3 new specs in the check-threshold block (0% excluded from the
batch, lone 0% sends nothing, 1% still alerts). 180 -> 183.

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.21.12 — 2026-10-06 08:01
+
+- Battery monitoring now ignores a 0% reading: a 0 (or any non-positive) `batteryLevel` is treated as an invalid/no-data value (node has no battery wired or is misconfigured) and no longer produces a "⚠️ battery low" alert, while genuinely-low readings (1–20%) still alert exactly as before. One-line guard added to `BatteryAlertService.shouldAlert` right after the `undefined` check. Tests: 3 new specs in the `check threshold` block — a 0% node is excluded from the batch (and a lone 0% sends nothing) while a 1% node still alerts.
+
 ## v0.21.11 — 2026-10-05 14:47
 
 - Migrated the opencode notifier to the v2 API routes: discovery is now `GET {api}{proxyPath}/api/session` (a `{ data, cursor }` envelope; sessions filtered by `location.directory`, most-recent `time.updated` wins) and send is now `POST {api}{proxyPath}/api/session/{sid}/prompt` with a `{text}` body, instead of the v1 `GET /session` + `POST /session/{id}/message` (`{parts:[{type:"text",text}]}`) routes. CodeNomad's per-workspace instance proxy was upgraded and now only serves opencode v2 `/api/*` — every v1 `/session/…` call 403s, which was breaking all notifications. v2 returns 2xx immediately (no longer holds the response until the turn finishes), so the 15 s read-timeout-as-delivered branch is kept only as a harmless safety net.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mesh-bot",
-  "version": "0.21.11",
+  "version": "0.21.12",
   "description": "",
   "author": "",
   "private": true,

src/battery/battery.service.spec.ts

@@ -119,6 +119,47 @@ describe('BatteryAlertService check threshold', () => {
     expect(sendText).not.toHaveBeenCalled();
   });
 
+  it('ignores a 0% reading (invalid/no battery) even though 0 <= threshold', async () => {
+    const sendText = vi.fn(async (..._args: unknown[]) => 1);
+    // 0% must not alert, but a genuinely-low 5% node in the same batch must
+    const svc = makeService([node(1, 0), node(2, 5)], sendText);
+
+    await svc.check();
+
+    expect(sendText).toHaveBeenCalledTimes(1);
+    // only the 5% node — the 0% node is excluded entirely
+    expect(sendText.mock.calls[0]).toEqual([
+      BROADCAST_ADDR,
+      '⚠️ battery low: @!00000002 5%',
+      undefined,
+      2,
+    ]);
+  });
+
+  it('ignores a lone 0% reading (no broadcast at all)', async () => {
+    const sendText = vi.fn(async (..._args: unknown[]) => 1);
+    const svc = makeService([node(1, 0)], sendText); // only an invalid 0% reading
+
+    await svc.check();
+
+    expect(sendText).not.toHaveBeenCalled();
+  });
+
+  it('still alerts a genuine 1% reading (lowest valid value)', async () => {
+    const sendText = vi.fn(async (..._args: unknown[]) => 1);
+    const svc = makeService([node(1, 1)], sendText);
+
+    await svc.check();
+
+    expect(sendText).toHaveBeenCalledTimes(1);
+    expect(sendText.mock.calls[0]).toEqual([
+      BROADCAST_ADDR,
+      '⚠️ battery low: @!00000001 1%',
+      undefined,
+      2,
+    ]);
+  });
+
   it('merges all qualifying nodes into exactly ONE broadcast with the broadcast target', async () => {
     const sendText = vi.fn(async (..._args: unknown[]) => 1);
     const svc = makeService(

src/battery/battery.service.ts

@@ -60,6 +60,7 @@ export class BatteryAlertService {
 
   private shouldAlert(node: NodeSummary, now: number): boolean {
     if (node.batteryLevel === undefined) return false; // no battery reported — skip
+    if (node.batteryLevel <= 0) return false; // 0/invalid reading — no battery wired or misconfigured node, not a real low-battery alert
     // <= on purpose: a node at exactly the threshold is already "low" (spec allowed either < or <=; tests pin this choice)
     if (!(node.batteryLevel <= this.threshold)) return false;
     const last = this.lastAlertAt.get(node.num);